extra credit

2. Source Pollution Pollutants discharged from a single identifiable location (e.g., pipes, ditches, channels, sewers, tunnels, containers of various types)
5. nitrogen compounds used for growth by plants and algae
7. the ability of a material to allow either heat or electricity to flow through it
9. two or more atoms held together by bonds
10. Horizontal row on the Periodic Table
11. organisms that are used to assess the health of a water system. The greater the variety, the healthier the water is. Trout are a good one.
13. vertical column on the Periodic Table; elements in the column share similar properties; also known as a Family
15. Source Pollution Pollution that enters a body of water from a large area, such as lawns, construction sites, and roads. All runoff.
16. an organism that makes its own food
18. Oxygen oxygen dissolved in water, dissolved oxygen is important for fish and other aquatic animals
19. simple substances that cannot be broken down into simpler substances
20. vertical column on the Periodic Table; elements in the column share similar properties; also knows as a Group

1. Attraction between opposite poles
3. Prepared or created artificially man-made, not found in nature
4. term that describes an organism that lives in water
6. the ability to dissolve in another substance
8. organisms that cannot make their own food and must feed on other organisms for energy and nutrients
12. a measure of the clarity of the water (how clear is it?) High turbidity= dirty water
14. a measure of how acidic or basic a solution is
17. term that describes an organism that lives on land